(A) Tweet everyone you know in your industry who might like your products
(B) Follow every person who has ever mentioned your company name
(C) Monitor conversations related to your industry and follow people whose interests align with what your community offers
(D) Twitter should not be used for community building
Twitter succeeds on conversation, making it an ideal platform for industries to build partnerships and culture through one-on-one interactions. Those interactions would, in many situations, be accessible to your followers, extending the scope and effect of your efforts.